Bug 811950 - Remove fixed position environment variable. r=roc, a=overholt

gfx/layers/ipc/ShadowLayersParent.cpp

@@ -246,11 +246,8 @@ ShadowLayersParent::RecvUpdate(const InfallibleTArray<Edit>& cset,
       layer->SetClipRect(common.useClipRect() ? &common.clipRect() : NULL);
       layer->SetBaseTransform(common.transform().value());
       layer->SetPostScale(common.postXScale(), common.postYScale());
-      static bool fixedPositionLayersEnabled = getenv("MOZ_ENABLE_FIXED_POSITION_LAYERS") != 0;
-      if (fixedPositionLayersEnabled) {
-        layer->SetIsFixedPosition(common.isFixedPosition());
-        layer->SetFixedPositionAnchor(common.fixedPositionAnchor());
-      }
+      layer->SetIsFixedPosition(common.isFixedPosition());
+      layer->SetFixedPositionAnchor(common.fixedPositionAnchor());
       if (PLayerParent* maskLayer = common.maskLayerParent()) {
         layer->SetMaskLayer(cast(maskLayer)->AsLayer());
       } else {

layout/base/nsDisplayList.cpp

@@ -551,11 +551,8 @@ static bool ForceVisiblityForFixedItem(nsDisplayListBuilder* aBuilder,
 
 void nsDisplayListBuilder::SetDisplayPort(const nsRect& aDisplayPort)
 {
-    static bool fixedPositionLayersEnabled = getenv("MOZ_ENABLE_FIXED_POSITION_LAYERS") != 0;
-    if (fixedPositionLayersEnabled) {
-      mHasDisplayPort = true;
-      mDisplayPort = aDisplayPort;
-    }
+    mHasDisplayPort = true;
+    mDisplayPort = aDisplayPort;
 }
 
 void nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(nsIFrame* aDirtyFrame,

mobile/android/base/GeckoAppShell.java

@@ -425,9 +425,6 @@ public class GeckoAppShell
         f = Environment.getDownloadCacheDirectory();
         GeckoAppShell.putenv("EXTERNAL_STORAGE=" + f.getPath());
 
-        // Enable fixed position layers
-        GeckoAppShell.putenv("MOZ_ENABLE_FIXED_POSITION_LAYERS=1");
-
         // setup the app-specific cache path
         f = context.getCacheDir();
         GeckoAppShell.putenv("CACHE_DIRECTORY=" + f.getPath());